> I have exhausted my ideas on how to get him off the list.
> Any ideas are most welcome.
First, I don't recommend sending listmembers the memberlist. I host
three lists (music-related) and I can assure you some of the lurking
members 'prefer' to remain silent and not outed.
As for your problem, I suggest you ask him to forward one of the
'offending' messages. Look in the headers, and you should be able
to see the address the message is sent to.
> He said that there is no matching address for him.
That's really weird - one address must match! Again, the headers
will reveal which address that match.